[OSM-dev] Algorithm help

[Francisco R. Santos]

On Wed, May 28, 2008 at 10:26 PM, Richard Fairhurst <richard at systemed.net>
wrote:

> Can anybody point me in the direction of an algorithm that will
> determine whether a closed way (polyline) is clockwise or anti-
> clockwise?
>

Take a look at this:

http://geometryalgorithms.com/Archive/algorithm_0101/algorithm_0101.htm#orientation2D_polygon()

Regards,
Quico
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